EXCESSIVE TEMPERATURE DETECTING SYSTEM OF ELECTRIC MOTOR CONTROLLER
First Claim
1. An excessive temperature detecting system of an electric motor controller comprising an inverter device for controlling driving electric power supplied to a motor arranged in a vehicle by controlling a semiconductor element for large electric power;
- a voltage detecting section for detecting the voltage of a filter capacitor inserted on a direct current side of said inverter device;
an electric current detecting section for detecting an output electric current of said inverter device;
a temperature detecting section arranged in cooling means of said semiconductor element;
a junction temperature calculating section for sequentially calculating loss caused by a switching operation of said semiconductor element by a detecting signal from each of said detecting sections, and calculating junction temperature of said semiconductor element on the basis of the calculated loss value; and
a comparing section for generating an excessive temperature detecting output when an output of said junction temperature calculating section reaches a predetermined allowable temperature.
1 Assignment
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Accused Products
Abstract
An electric motor controller for a vehicle has a voltage detecting section for detecting the voltage of a filter capacitor inserted on a direct current side of an inverter device including a semiconductor element for large electric power; an electric current detecting section for detecting an output electric current of the inverter device; and a temperature detecting section arranged in a cooling means of the semiconductor element for large electric power. Loss generated by a switching operation of the semiconductor element for large electric power is sequentially calculated by outputs of the detecting sections. Excessive temperature is detected when junction temperature of the large electric power semiconductor element calculated by this loss reaches an allowable temperature.
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Citations
5 Claims
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1. An excessive temperature detecting system of an electric motor controller comprising an inverter device for controlling driving electric power supplied to a motor arranged in a vehicle by controlling a semiconductor element for large electric power;
- a voltage detecting section for detecting the voltage of a filter capacitor inserted on a direct current side of said inverter device;
an electric current detecting section for detecting an output electric current of said inverter device;
a temperature detecting section arranged in cooling means of said semiconductor element;
a junction temperature calculating section for sequentially calculating loss caused by a switching operation of said semiconductor element by a detecting signal from each of said detecting sections, and calculating junction temperature of said semiconductor element on the basis of the calculated loss value; and
a comparing section for generating an excessive temperature detecting output when an output of said junction temperature calculating section reaches a predetermined allowable temperature. - View Dependent Claims (2, 3, 4, 5)
- a voltage detecting section for detecting the voltage of a filter capacitor inserted on a direct current side of said inverter device;
Specification